mbufbf.c

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    xfree(pDrawable);
}

/*ARGSUSED*/
static int
bufCreateImageBuffers (pWin, nbuf, ids, action, hint)
    WindowPtr	pWin;
    int		nbuf;
    XID		*ids;
    int		action;
    int		hint;
{
    ScreenPtr		pScreen;
    mbufScreenPtr	pMBScreen;
    mbufWindowPtr	pMBWindow;
    mbufBufferPtr	pMBBuffer;
    int			i;

    pScreen   = pWin->drawable.pScreen;
    pMBScreen = MB_SCREEN_PRIV(pScreen);
    pMBWindow = MB_WINDOW_PRIV(pWin);

    pMBWindow->devPrivate.ptr = (pointer) REGION_CREATE(pScreen, 0,0);
    if (!pMBWindow->devPrivate.ptr)
	return(0);
    REGION_COPY(pScreen, (RegionPtr) pMBWindow->devPrivate.ptr,
			    &pWin->clipList);

    for (i = 0; i < nbuf; i++)
    {
	pMBBuffer = pMBWindow->buffers + i;
	pMBBuffer->pDrawable = (DrawablePtr) bufCreateBuffer(pScreen,pWin,i);

	if (!pMBBuffer->pDrawable)
	    break;

	if (!AddResource (ids[i], MultibufferDrawableResType,
			  (pointer) pMBBuffer->pDrawable))
	{
	    bufDestroyBuffer((BufferPtr) pMBBuffer->pDrawable);
	    break;
	}
	pMBBuffer->pDrawable->id = ids[i];

	/*
	 * If window is already mapped, generate exposures and
	 * clear the area of the newly buffers.
	 */

	if ((pWin->realized) && (i != pMBWindow->displayedMultibuffer))
	    (* pMBScreen->ClearImageBufferArea)(pMBBuffer, 0,0, 0,0, TRUE);
    }

    return i;
}

static void
bufDestroyImageBuffers(pWin)
    WindowPtr	pWin;
{
    ScreenPtr		pScreen;
    mbufWindowPtr	pMBWindow;

    pScreen   = pWin->drawable.pScreen;

    if (pMBWindow = MB_WINDOW_PRIV(pWin))
    {
	mbufBufferPrivPtr pMBPriv = MB_SCREEN_PRIV_BUFFER(pScreen);

	/*
	 * if the backbuffer is currently being displayed, move the bits
	 * to the frontbuffer and display it instead.
	 */

	if (pWin->realized && (pMBWindow->displayedMultibuffer == BACK_BUFFER))
	{
	    (* pMBPriv->CopyBufferBits)(pMBWindow, BACK_BUFFER, FRONT_BUFFER);
	    REGION_SUBTRACT(pScreen, &pMBPriv->backBuffer,
				  &pMBPriv->backBuffer, &pWin->clipList);
	    (* pMBPriv->DrawSelectPlane)(pScreen, pMBPriv->selectPlane,
			    &pWin->clipList, FRONT_BUFFER);
	}

	/* Switch window rendering to front buffer */
	pWin->devPrivates[frameWindowPrivateIndex] =
	    pMBPriv->frameBuffer[FRONT_BUFFER];

	REGION_DESTROY(pScreen, (RegionPtr) pMBWindow->devPrivate.ptr);
	pMBWindow->devPrivate.ptr = NULL;
    }
}

/*
 * Can be replaced by pScreen->ClearToBackground if pBuffer->eventMask
 * and wOtherEventsMasks(pBuffer) were setup.
 */

static void
bufClearImageBufferArea(pMBBuffer, x,y, w,h, generateExposures)
    mbufBufferPtr	pMBBuffer;
    short		x,y;
    unsigned short	w,h;
    Bool		generateExposures;
{
    BoxRec box;
    RegionRec	reg;
    RegionPtr pBSReg = NullRegion;
    ScreenPtr	pScreen;
    BoxPtr  extents;
    int	    x1, y1, x2, y2;
    BufferPtr pBuffer;

    pBuffer = (BufferPtr) pMBBuffer->pDrawable;
    /* compute everything using ints to avoid overflow */

    x1 = pBuffer->drawable.x + x;
    y1 = pBuffer->drawable.y + y;
    if (w)
        x2 = x1 + (int) w;
    else
        x2 = x1 + (int) pBuffer->drawable.width - (int) x;
    if (h)
        y2 = y1 + h;	
    else
        y2 = y1 + (int) pBuffer->drawable.height - (int) y;

    extents = &pBuffer->clipList.extents;
    
    /* clip the resulting rectangle to the window clipList extents.  This
     * makes sure that the result will fit in a box, given that the
     * screen is < 32768 on a side.
     */

    if (x1 < extents->x1)
	x1 = extents->x1;
    if (x2 > extents->x2)
	x2 = extents->x2;
    if (y1 < extents->y1)
	y1 = extents->y1;
    if (y2 > extents->y2)
	y2 = extents->y2;

    if (x2 <= x1 || y2 <= y1)
    {
	x2 = x1 = 0;
	y2 = y1 = 0;
    }

    box.x1 = x1;
    box.x2 = x2;
    box.y1 = y1;
    box.y2 = y2;

    pScreen = pBuffer->drawable.pScreen;
    REGION_INIT(pScreen, &reg, &box, 1);
    if (pBuffer->backStorage)
    {
	/*
	 * If the window has backing-store on, call through the
	 * ClearToBackground vector to handle the special semantics
	 * (i.e. things backing store is to be cleared out and
	 * an Expose event is to be generated for those areas in backing
	 * store if generateExposures is TRUE).
	 */
	pBSReg = (* pScreen->ClearBackingStore)(pBuffer, x, y, w, h,
						 generateExposures);
    }

    REGION_INTERSECT(pScreen, &reg, &reg, &pBuffer->clipList);
    if (pBuffer->backgroundState != None)
	(*pScreen->PaintWindowBackground)(pBuffer, &reg, PW_BACKGROUND);
    if (generateExposures)
	MultibufferExpose(pMBBuffer, &reg);
#ifdef _notdef
    /* XXBS - This is the original miClearToBackground code.
     * WindowExposures needs to be called (or the functionality emulated)
     * in order for backingStore to work, but first, pBuffer->eventMask
     * and wOtherEventsMasks(pBuffer) need to be setup correctly.
     */

    if (generateExposures)
	(*pScreen->WindowExposures)(pBuffer, &reg, pBSReg);
    else if (pBuffer->backgroundState != None)
        (*pScreen->PaintWindowBackground)(pBuffer, &reg, PW_BACKGROUND);
#endif
    REGION_UNINIT(pScreen, &reg);
    if (pBSReg)
	REGION_DESTROY(pScreen, pBSReg);
}

static void
bufWrapScreenFuncs(pScreen)
    ScreenPtr pScreen;
{
    mbufBufferPrivPtr pMBPriv = MB_SCREEN_PRIV_BUFFER(pScreen);

    WRAP_SCREEN_FUNC(pScreen,pMBPriv,PostValidateTree, bufPostValidateTree);
    WRAP_SCREEN_FUNC(pScreen,pMBPriv,ClipNotify, bufClipNotify);
    WRAP_SCREEN_FUNC(pScreen,pMBPriv,WindowExposures,bufWindowExposures);
    WRAP_SCREEN_FUNC(pScreen,pMBPriv,ChangeWindowAttributes, bufChangeWindowAttributes);
    WRAP_SCREEN_FUNC(pScreen,pMBPriv,ClearToBackground,bufClearToBackground);
    WRAP_SCREEN_FUNC(pScreen,pMBPriv,CopyWindow,bufCopyWindow);
}

static void
bufResetProc(pScreen)
    ScreenPtr pScreen;
{
    mbufBufferPrivPtr pMBPriv = MB_SCREEN_PRIV_BUFFER(pScreen);

    /*
     * frameBuffer, selectPlane, and pInfo should be freed by
     * whoever called RegisterDoubleBufferHardware
     */

    REGION_UNINIT(pScreen, &pMBPriv->backBuffer);
    REGION_UNINIT(pScreen, &pMBPriv->subtractRgn);
    REGION_UNINIT(pScreen, &pMBPriv->unionRgn);
    xfree(pMBPriv);
}

/*---------------------------------------------------------------------------*/

/* 
 * Used if CopyBufferBitsFunc is not provided when registering.
 * This should work for everybody since CopyArea needs to support
 * copying between buffers anyway.
 */

static void
bufCopyBufferBits(pMBWindow, srcBufferNum, dstBufferNum)
    mbufWindowPtr pMBWindow;
    int srcBufferNum, dstBufferNum;
{
    DrawablePtr pSrcBuffer, pDstBuffer;
    GCPtr pGC;

    pSrcBuffer = pMBWindow->buffers[srcBufferNum].pDrawable;
    pDstBuffer = pMBWindow->buffers[dstBufferNum].pDrawable;

    pGC = GetScratchGC (pDstBuffer->depth, pDstBuffer->pScreen);
    if (!pGC)
	return;

    ValidateGC (pDstBuffer, pGC);
    (* pGC->ops->CopyArea) (pSrcBuffer, pDstBuffer, pGC,
		    0,0, pDstBuffer->width, pDstBuffer->height, 0,0);
    FreeScratchGC (pGC);
}

/*
 * Used if DrawSelectPlanFunc is not provided for when registering.
 * However, it only works if selectPlane.ptr is a drawable. Also
 * assumes that painting with color 0 selects the front buffer,
 * while color 1 selects the back buffer.
 */

static void
bufDrawSelectPlane(pScreen, selectPlane, prgn, bufferNum)
    ScreenPtr	pScreen;
    DevUnion	selectPlane;
    RegionPtr	prgn;
    long	bufferNum;
{
    DrawablePtr pDrawable;
    GCPtr pGC;
    register int i;
    register BoxPtr pbox;
    register xRectangle *prect;
    int numRects;
    XID	value;

    if (REGION_NUM_RECTS(prgn) == 0)
	return;

    pDrawable = (DrawablePtr) selectPlane.ptr;
    pGC = GetScratchGC (pDrawable->depth, pScreen);
    if (!pGC)
	return;

    prect = (xRectangle *)ALLOCATE_LOCAL(REGION_NUM_RECTS(prgn) *
					 sizeof(xRectangle));
    if (!prect)
    {
	FreeScratchGC(pGC);
	return;
    }

    value = (XID) bufferNum;
    DoChangeGC(pGC, GCForeground, &value, 0);
    ValidateGC(pDrawable, pGC);

    numRects = REGION_NUM_RECTS(prgn);
    pbox = REGION_RECTS(prgn);
    for (i= numRects; --i >= 0; pbox++, prect++)
    {
	prect->x = pbox->x1;
	prect->y = pbox->y1;
	prect->width = pbox->x2 - pbox->x1;
	prect->height = pbox->y2 - pbox->y1;
    }
    prect -= numRects;
    (* pGC->ops->PolyFillRect)(pDrawable, pGC, numRects, prect);

    DEALLOCATE_LOCAL(prect);
    FreeScratchGC (pGC);
}


static void
bufDisplayImageBuffers(pScreen, ppMBWindow, ppMBBuffer, nbuf)
    ScreenPtr		pScreen;
    mbufBufferPtr	*ppMBBuffer;
    mbufWindowPtr	*ppMBWindow;
    int			nbuf;
{
    WindowPtr       pWin;
    BufferPtr	    pPrevBuffer, pNewBuffer;
    int		    i, number;
    mbufBufferPrivPtr pMBPriv;
    mbufBufferPtr   pPrevMBBuffer;

    pMBPriv   = MB_SCREEN_PRIV_BUFFER(pScreen);

    for (i = 0; i < nbuf; i++)
    {
	number = ppMBBuffer[i]->number; /* 0=frontbuffer, 1=backbuffer */
	pWin = ppMBWindow[i]->pWindow;
	pPrevMBBuffer = MB_DISPLAYED_BUFFER(ppMBWindow[i]);

	pPrevBuffer = (BufferPtr) pPrevMBBuffer->pDrawable;
	pNewBuffer  = (BufferPtr) ppMBBuffer[i]->pDrawable;

	if (pPrevBuffer != pNewBuffer)
	{
	    RegionPtr backBuffer = &pMBPriv->backBuffer;

	    /*
	     * Update the select plane and the backBuffer region.
	     */

	    (* pMBPriv->DrawSelectPlane)(pScreen, pMBPriv->selectPlane,
			    &pWin->clipList, number);

	    if (number == BACK_BUFFER)
		REGION_UNION(pScreen, backBuffer, backBuffer,
				   &pWin->clipList);
	    else
		REGION_SUBTRACT(pScreen, backBuffer, backBuffer,
				   &pWin->clipList);

	    /* Switch which framebuffer the window draws into */
	    pWin->devPrivates[frameWindowPrivateIndex] =